I am so sorry to hear that this is happening to you so early in your marriage. Still, it's a blessing to see and know these things early. Basically, knowledge is power, and if you find a cancer early, it can be cured. There is hope.
As to your husband, yes, many young and immature spouses participate in this behavior. It is largely due to the fact that neither of you have any clear expectations as to what your marriage should be like, and because your expectations have likely not been communicated.
I would invite you to research all the material on this site. You'll find the key to finding love is to to give it wholeheartedly and expect little or nothing in return. It's work -- and marriages are about work.
You may wish to encourage your husband's outings (but ask that he keep them to once a week or so), and be VERY understanding that you're both undergoing a transition period. Read up on this site, and you'll see why I suggest this as a course of action. Men often view marriage as having to give their freedom, and if you push to hard for togetherness at this early stage, he'll likely want to stay out even more.
Basically, if you both came into the marriage expecting the other spouse to fulfill your needs without communicating them, both of you are doomed. If you both can shift your perspective to trying to meet your spouse's needs before your own (and yes, you may need to be leader on this at first) you'll have a long, prosperous relationship.
It's not really about the ages, although immaturity does play a role in things. It's about giving more than taking, and if you are able to do it -- doing the right thing brings happiness -- not the other way around.
Check on this site, and keep us updated on how things are going. Invite God into your relationship, and ask what he would want you to do. He'll never steer you wrong...
God Bless!
